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Leadership development, coaching and change management.


Harold Hillman is the Managing Director of Sigmoid Curve Consulting Group, a company he launched in December 2006. Sigmoid specialises in leadership development, executive coaching and change management.


He earned a Master's Degree in Education from Harvard University and a PhD in Clinical Psychology from the University of Pittsburgh (USA).

Current work

Harold coaches business leaders and executive teams to appreciate the strong relationship between leadership and learning. Charismatic and highly-regarded in both the private and public sectors, he is frequently invited to deliver keynote speeches and workshops, and to give presentations at conferences in the arena of talent and human capital, particularly in the following topic areas:

¢ Leadership is at the core of the Sigmoid practice and Harold can speak on many different

aspects of individual and team leadership.

¢ Why authenticity is important for organisations.

¢ In his newly published book, The Impostor Syndrome: Becoming an Authentic Leader, Harold

shares very personal aspects of his own life's journey and uses real-life case studies.

¢ Leading change how individuals and teams can establish a positive and proactive

relationship with change.

¢ Why strong teams are imperative to business success.

¢ Why diversity is imperative to business success.

¢ Stretching yourself to build a successful career.

¢ How to create a learning organisation.

¢ Resilience how to build resilient people, teams and organisations.

¢ Comparing and contrasting how business is conducted in the US and New Zealand.


Harold's first book, The Impostor Syndrome: Becoming An Authentic Leader, was published by Random House New Zealand in December 2013 and by Random House Australia in February 2014. It has already gone to reprint and Whitcoulls named it their ˜Best Business Book 2013.'

In 2021 Harold released his book EM-PA-THY, published by Bateman Books which has a focus on empathy and the human side of leadership.

He migrated to New Zealand in 2003 to join Fonterra and help lay the foundation for the dairy co-operative to realise its vision of being the global leader in dairy. Harold served in two roles with Fonterra, initially as Interim Group HR Director on the Fonterra Leadership Team and then in the role for which he was recruited, Director of Talent & Organisational Development. Harold's contributions established Fonterra as a benchmark in people engagement strategies, evidenced by strong performance on key engagement factors typically tracked by global companies of comparable size.

Harold became a proud New Zealand citizen in 2008 and over the past 20 years has worked with a number of prominent chief executives and their teams in the US and Australasia, including: Larry Fuller of Amoco, Art Ryan of Prudential Financial, Sanjay Khosla of Kraft Foods International, Andrew Ferrier of Fonterra, Graham Stuart of Sealord, Ken Rivers of Shell and Refining NZ, Andrew Thorburn of Bank of New Zealand, Rick Ellis of TVNZ and Doug McKay of Auckland Council. His career highlights include: Assistant Professor and Director, Leadership Programs at the US Air Force Academy, Colorado; Director, Amoco Management Learning Center, Amoco Corporation, Chicago; Corporate Vice President & Chief Learning Officer, Prudential Financial, New York.

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